描述:
The epidermal growth factor receptor (EGF R) subfamily of receptor tyrosine kinases
comprises four members: EGF R (also known as HER1, ErbB1 or ErbB), ErbB2 (Neu,
HER2), ErbB3 (HER3), and ErbB4 (HER4). All family members are type I transmembrane
glycoproteins that have an extracellular domain which contains two cysteine rich
domains separated by a spacer region that is involved in ligand binding, and a
cytoplasmic domain which has a membraneproximal tyrosine kinase
domain and a Cterminal tail with multiple tyrosine autophosphorylation sites.
The human EGF R gene encodes a 1210 amino acid (aa) residue precursor with a 24 aa
putative signal peptide, a 621 aa extracellular domain, a 23 aa transmembrane domain,
and a 542 aa cytoplasmic domain. EGF R has been shown to bind a subset of the EGF
family ligands, including EGF, amphiregulin, TGFα, betacellulin, epiregulin, heparinbinding
EGF and neuregulin2α in the absence of a coreceptor. Ligand binding induces EGF R
homodimerization as well as heterodimerization with ErbB2, resulting in kinase
activation, tyrosine phosphorylation and cell signaling. EGF R can also be recruited
to form heterodimers with the ligandactivated ErbB3 or ErbB4. EGF R signaling has
been shown to regulate multiple biological functions including cell proliferation,
differentiation, motility and apoptosis. In addition, EGF R signaling has also been
shown to play a role in carcinogenesis.
原厂资料:
The epidermal growth factor receptor (EGF R) subfamily of receptor tyrosine kinases
comprises four members: EGF R (also known as HER1, ErbB1 or ErbB), ErbB2 (Neu,
HER2), ErbB3 (HER3), and ErbB4 (HER4). All family members are type I transmembrane
glycoproteins that have an extracellular domain which contains two cysteine rich
domains separated by a spacer region that is involved in ligand binding, and a
cytoplasmic domain which has a membraneproximal tyrosine kinase
domain and a Cterminal tail with multiple tyrosine autophosphorylation sites.
The human EGF R gene encodes a 1210 amino acid (aa) residue precursor with a 24 aa
putative signal peptide, a 621 aa extracellular domain, a 23 aa transmembrane domain,
and a 542 aa cytoplasmic domain. EGF R has been shown to bind a subset of the EGF
family ligands, including EGF, amphiregulin, TGFα, betacellulin, epiregulin, heparinbinding
EGF and neuregulin2α in the absence of a coreceptor. Ligand binding induces EGF R
homodimerization as well as heterodimerization with ErbB2, resulting in kinase
activation, tyrosine phosphorylation and cell signaling. EGF R can also be recruited
to form heterodimers with the ligandactivated ErbB3 or ErbB4. EGF R signaling has
been shown to regulate multiple biological functions including cell proliferation,
differentiation, motility and apoptosis. In addition, EGF R signaling has also been
shown to play a role in carcinogenesis.